Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Serializer\Mapping\Factory\trigger_deprecation() in D:\Webserver\Apache24\htdocs\testephp\signxml\vendor\symfony\serializer\Mapping\Factory\ClassMetadataFactoryCompiler.php:17 Stack trace: #0 {main} thrown in D:\Webserver\Apache24\htdocs\testephp\signxml\vendor\symfony\serializer\Mapping\Factory\ClassMetadataFactoryCompiler.php on line 17